Add this to your custom css code area in the theme admin
`
#sidebar {
clear:left;
float:none;
width:960px;
}
`
If you only want this to happen on your blog pages then add .blog to the front like this
`
.blog #sidebar {
clear:left;
float:none;
width:960px;
}
`

There width: auto; for content sucks. What to do if I need more flexible content (without gole between content and sidebar)?

2/ It sucks in really high resolution (like on iMac 27" ). I tried to fix it with max-width for content, but sidebar is still at right side of page. How to attach it to right side of div id="nav", not page?